| Year | Count |
|---|---|
| 1977 | 14 |
| 1978 | 12 |
| 1979 | 15 |
| 1983 | 10 |
| 1984 | 5 |
| 1985 | 25 |
| 1986 | 5 |
| 1987 | 5 |
| 1989 | 10 |
| 1990 | 44 |
| 1991 | 43 |
| 1992 | 9 |
| 1993 | 31 |
| 1996 | 5 |
| 1997 | 25 |
| 1998 | 26 |
| 1999 | 12 |
| 2000 | 30 |
| 2001 | 11 |
| 2002 | 15 |
| 2003 | 30 |
| 2004 | 18 |
| 2006 | 9 |
| 2007 | 23 |
| 2008 | 13 |
| 2010 | 13 |
| 2011 | 13 |
| 2012 | 25 |
| 2013 | 35 |
| 2014 | 67 |
| 2015 | 104 |
| 2016 | 126 |
| 2017 | 176 |
| 2018 | 90 |
| 2019 | 119 |
| 2020 | 108 |
| 2021 | 156 |
| 2022 | 124 |
| 2023 | 158 |
| 2024 | 156 |